Hair drying bonnet



FIG. 1 is a perspective view of a hair drying bonnet showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof; and

FIG. 5 is a left side view thereof; the other side is a mirror image;

FIG. 6 is a bottom view thereof. 

The ornamental design for a hair drying bonnet, substantially as shown and described. 